Abstract:Objective To investigate the expressions of serum microRNA-17 (miR-17) and netrin-4 in patients with gestational diabetes mellitus (GDM) and their relationship with pregnancy outcomes.Methods A retrospective analysis was conducted on 98 GDM patients diagnosed and treated in the Second Affiliated Hospital of Nantong University from January 2022 to June 2023. According to the pregnancy outcomes, GDM patients were divided into the control group (normal pregnancy outcomes) and the study group (adverse pregnancy outcomes), with 65 and 33 cases, respectively. Clinical data of all patients were collected, including age, gravidity and parity, results of the oral glucose tolerance test (OGTT), fasting plasma glucose (FPG), glycosylated hemoglobin (HbA1c), total cholesterol (TC), triglyceride (TG), albumin (ALB), fasting insulin (FINS), and insulin resistance index (HOMA-IR). The expressions of miR-17 and netrin-4 were measured by quantitative real-time polymerase chain reaction. The factors contributing to unfavorable pregnancy outcomes in GDM were analyzed.Results There were significant differences in BMI, results of OGTT at 2 h, the level of HbA1c, and HOMA-IR between the control group and the study group (P < 0.05). Compared with the control group, the relative expression of miR-17 in the study group was higher (P <0.05), while the relative expression of netrin-4 was lower in the study group (P < 0.05). Multivariable Logistic regression analysis (inclusion of variables with P-value < 0.05 and exclusion of variables with P-value > 0.10) showed that high 2-hour plasma glucose levels in OGTT [O^R = 1.548 (95% CI: 1.512, 2.531) ], high HbA1c levels [O^R = 3.041 (95% CI: 1.054, 3.412) ], high expressions of miR-17 [O^R = 2.865 (95% CI: 0.741, 3.905) ], and low expressions of netrin-4 [O^R = 0.743 (95% CI: 0.378, 0.835) ] were all risk factors for adverse pregnancy outcomes (P < 0.05).Conclusions The increased expression of miR-17 and the decreased expression of netrin-4 in the serum of GDM patients are both factors contributing to the adverse pregnancy outcomes.